import html2Canvas from 'html2canvas'
import JsPDF from 'jspdf'

var getPdf = function (title, id) {
  if (title == null || title === '' || id == null || id === '') {
    return
  }
  html2Canvas(document.querySelector('#' + id), {
    allowTaint: true
  }).then(function (canvas) {
    let contentWidth = canvas.width
    let contentHeight = canvas.height
    let pageHeight = contentWidth / 592.28 * 841.89
    let leftHeight = contentHeight
    let position = 10
    let imgWidth = 595.28
    let imgHeight = 592.28 / contentWidth * contentHeight
    let pageData = canvas.toDataURL('image/jpeg', 1.0)
    let PDF = new JsPDF('', 'pt', 'a4')
    if (leftHeight < pageHeight) {
      //
      PDF.addImage(pageData, 'JPEG', 0, 10, imgWidth, imgHeight)
    } else {
      while (leftHeight > 0) {
        PDF.addImage(pageData, 'JPEG', 0, position, imgWidth, imgHeight)
        leftHeight -= pageHeight
        position -= 841.89
        if (leftHeight > 0) {
          PDF.addPage()
        }
      }
    }
    PDF.save(title + '.pdf')
  })
}

export default {
  getPdf
}
